Fix hash buffer size in pkey programs
diff --git a/programs/pkey/pk_verify.c b/programs/pkey/pk_verify.c
index fa3c0e0..4041397 100644
--- a/programs/pkey/pk_verify.c
+++ b/programs/pkey/pk_verify.c
@@ -59,7 +59,7 @@
     int ret = 1;
     size_t i;
     mbedtls_pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];